The invention relates to a large vocabulary speech recognition system with the ability to recognize alphanumeric sequences. The recognition system prompts the caller to spell out an alphanumeric sequence in the form "letter for word" (eg A for Apple) and then uses the first letter of the word in combination...http://www.google.fr/patents/US6629071?utm_source=gb-gplus-shareBrevet US6629071 - Speech recognition system
